The Ecology of a Bite: Environment, Evolution and Diet in Gray Foxes

Inhabiting the channel islands, island foxes have a basic habitat compared to mainland foxes. Environmental data (human impact, prey availability, habitat) from Google Scholar and morphometric data (trigonid & talonid length and area) from the University of California, Los Angeles’s Dickey Collection were integrated to gain a comprehensive understanding on whether and the extent determinants contribute to shaping tooth morphology and diets in gray foxes. Methodologically, logistic regression predicts binary dietary preferences, multiple linear regression exhibits the degree of the environmental variable’s influence on BTG ratio, cluster analysis groups sets of environment controls together to uncover distinguishing traits or behaviors, and hypothesis testing determines the statistical significant differences in the mean BTG ratio between foxes to examine whether habitat type has a pronounced effect on the tooth structure. Subsequently, the multiple linear regression revealed habitat and human impact to be significant, but prey availability to have a marginal role. Although predicting meat diets was high, the logistic model’s performance was poor for plant diets, and an issue of imbalance in the dataset seemed a likely cause. Representing meat and plant diet, cluster analysis corroborated the habitat and diets’ role in dictating the tooth anatomy. Ultimately, the one-way ANOVA didn’t identify significant variation among mainland and island foxes for BTG ratios (F = 2.18, p = 0.15), suggesting that habitat type isn’t a significant influencer. Concluding these findings about the evolutionary ecological mechanisms and environmental morpho-ecological traits, future studies could build on these observations through seasonal variations and genetic analysis.